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Articles 30 registres trobats  inicianterior21 - 30  anar al registre: La cerca s'ha fet en 0.01 segons. 
21.
26 p, 752.3 KB Universal centers and composition conditions / Giné, Jaume (Universitat de Lleida. Departament de Matemàtica) ; Grau, Maite (Universitat de Lleida. Departament de Matemàtica) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we characterize the universal centers of the ordinary differential equations dρ/dθ =∑∞i=1 ai(θ)ρi+1, where ai(θ) are trigonometric polynomials, in terms of the composition conditions. [...]
2013 - 10.1112/plms/pds050
Proceedings of the London Mathematical Society. Third Series, Vol. 106 (2013) , p. 481-507  
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22.
19 p, 311.7 KB Center conditions and cyclicity for a family of cubic systems: computer algebra approach / Fercec, Brigita (University of Maribor(Slovenia).Center for Applied Mathematics and Theoretical Physics) ; Mahdi, Adam (University of North Carolina at Charlotte. Mathematics Department)
Using methods of computational algebra we obtain an upper bound for the cyclicity of a family of cubic systems. To that end we overcome the problem of nonradicality of the associated Bautin ideal by moving from the ring of polynomials to a coordinate ring. [...]
2013 - 10.1016/j.matcom.2013.02.003
Mathematics and computers in simulation, Vol. 87 (2013) , p. 55-67  
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23.
23 p, 2.0 MB Global phase portraits of some reversible cubic centers with collinear or infinitely many singularities / Caubergh, Magdalena (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We study the reversible cubic vector fields of the form ˙x = −y + ax2 + bxy + cy2 − y(x2 + y2), y˙ = x + dx2 + exy + fy2 + x(x2 + y2), having simultaneously a center at infinity and at the origin. [...]
2012 - 10.1142/S0218127412502732
International journal of bifurcation and chaos in applied sciences and engineering, Vol. 22 Núm. 11 (2012) , p. 1250273 (20 pages)  
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24.
4 p, 255.2 KB Centers on center manifolds in the Lu system / Mahdi, Adam (University of North Carolina at Charlotte. Mathematics Department) ; Pessoa, Claudio (Universidade Estadual Paulista(Brazil)) ; Shafer, Douglas S. (AGH University of Science and Technology(Poland). Faculty of Applied Mathematics)
We confirm a conjecture of Mello and Coelho [Physics Letters A 373 (2009) 1116-1120] concerning the existence of centers on local center manifolds at equilibria of the Lü system of differential equations on R3. [...]
2011 - 10.1016/j.physleta.2011.08.022
Physics Letters. A, Vol. 375 (2011) , p. 3509-3511  
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25.
18 p, 697.9 KB Center conditions for a class of planar rigid polynomial differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Rabanal, Roland (Pontificia Universidad Católica del Perú. Departamento de Ciencias)
In general the center-focus problem cannot be solved, but in the case that the singularity has purely imaginary eigenvalues there are algorithms to solving it. The present paper implements one of these algorithms for the polynomial differential systems of the form x = −y + xf (x)g(y), y = x + yf (x)g(y), where f (x) and g(y) are arbitrary polynomials. [...]
2015 - 10.3934/dcds.2015.35.1075
Discrete and continuous dynamical systems. Series A, Vol. 35 Núm. 3 (2015) , p. 1075-1090  
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26.
13 p, 800.0 KB Centers for the Kukles homogeneous systems with odd degree / Giné, Jaume (Universitat de Lleida. Departament de Matemàtica) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Instituto Superior Técnico (Lisboa). Departamento de Matemática)
For the polynomial differential system x ̇ = −y, y ̇ = x Q n (x, y), where Q n (x, y) is a homogeneous polynomial of degree n there are the following two conjectures raised in 1999. (1) Is it true that the previous system for n 2 has a center at the origin if and only if its vector field is symmetric about one of the coordinate axes? (2) Is it true that the origin is an isochronous center of the previous system with the exception of the linear center only if the system has even degree? We prove both conjectures for all n odd.
2015 - 10.1112/blms/bdv005
Bulletin of the London Mathematical Society, Vol. 47 Núm. 2 (2015) , p. 315-324  
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27.
28 p, 932.5 KB Bifurcation of the separatrix skeleton in some 1-parameter families of planar vector fields / Caubergh, Magdalena (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
This article deals with the bifurcation of polycycles and limit cycles within the 1-parameter families of planar vector fields X_m^k, defined by =y^3-x^2k 1,=-x my^4k 1, where m is a real parameter and k1 integer. [...]
2015 - 10.1016/j.jde.2015.02.036
Journal of differential equations, Vol. 259 (2015) , p. 989-1013  
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28.
20 p, 360.1 KB Divergence and Poincaré-Liapunov constants for analytic differential systems / Grau, Maite (Universitat de Lleida. Departament de Matemàtica) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We consider a planar autonomous real analytic differential system with a monodromic singular point p. We deal with the center problem for the singular point p. Our aim is to highlight some relations between the divergence of the system and the Poincar\'e-Liapunov constants of p when these are defined.
2015 - 10.1016/j.jde.2015.01.035
Journal of differential equations, Vol. 258 (2015) , p. 4348-4367  
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29.
16 p, 174.0 KB Normalization of Poincaré singularities via variation of constants / Carletti, Timoteo ; Margheri, Alessandro ; Villarini, Massimo
We present a geometric proof of the Poincaré-Dulac Normalization Theorem for analytic vector fields with singularities of Poincaré type. Our approach allows us to relate the size of the convergence domain of the linearizing transformation to the geometry of the complex foliation associated to the vector field. [...]
2005 - 10.5565/PUBLMAT_49105_09
Publicacions matemàtiques, V. 49 N. 1 (2005) , p. 197-212  
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30.
20 p, 569.1 KB Complexity analysis of the analytic center cutting plane method that uses multiple cuts / Ye, Yinyu
We analyze the complexity of the analytic center cutting plane or column generation algorithm for solving general convex problems defined by a separation oracle. The oracle is called at the analytic center of a polytope, which contains a solution set and is given by the intersection of the linear inequalities previously generated from the oracle. [...]
1997
Mathematical Programming, vol. 78 n. 1 (1997) p. 85-104  
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